Forman, ND 58032 Frost Dates
58032, near Forman, ND: the frost window
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 10/01, roughly 146 days after the last spring frost.
Zone 4a (-30 to -25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Forman, not a forecast for this year.
Stretching the season past the first frost
Forman's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Forman against the rest of the dataset
About 146 days separate Forman's last and first frost, putting it 36,090 of 40,283 ZIP codes nationally. Within ND, it ranks 48 of 405.
Learn more
Two guides worth reading on 58032: the frost range, on how to read the range around Forman's dates instead of trusting one, and local microclimates, on what one yard in Forman can differ from the 58032 normal.